Chlorine gas turns a damp starch-iodide paper

Assessment: JAMB UTME - Chemistry - 2003 Subject: Chemistry

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Chlorine gas turns a damp starch-iodide paper
Answer Details
Chlorine gas turns a damp starch-iodide paper dark blue. This is because the chlorine gas reacts with the iodide ions in the paper to produce iodine, which then reacts with the starch in the paper to form a dark blue complex. This reaction is often used as a test for the presence of chlorine gas.
Read lesson note on Acids, Bases And Salts (Ghana Only) (WAEC)
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